Fixed JSHint warnings.
Fixed global leaks.

Bug in https://github.com/flatiron/revalidator; workaround by removing inadvertent declaration of `window` as a global variable.
Merge branch 'feature/global-leaks' into develop
Removed obsolete tests.
Registry.add() pings the service.
Ignoring ping error from non-Sage services.
Service#registry returns promise that's resolved when URL is set.
Version bump. Changelog.
Merge branch 'release/0.1.0' into develop